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DENVER (AP) – Colorado Rockies star outfielder Carlos Gonzalez had a small tumor removed from his left index finger Tuesday during a procedure at the Cleveland Clinic.

Gonzalez underwent exploratory surgery with Dr. Thomas Graham and a growth was found beneath the sheath around the muscle.

Rockies head athletic trainer Keith Dugger said these type of tumors are common and the expectation is a biopsy will determine the tumor is benign.

Carlos Gonzalez #5 of the Colorado Rockies hits an RBI single to score Drew Stubbs #13 of the Colorado Rockies as catcher J.P. Arencibia #7 of the Texas Rangers backs up the plate and the Rockies take a 3-1 lead in the third inning during Interleague play at Coors Field on May 6, 2014 in Denver, Colorado. (Photo by Doug Pensinger/Getty Images)

“These little benign tumors, which we hope it is, is probably the second most common finding in the finger besides cysts,” Dugger said. “Usually repetitive trauma causes it.

“They call them cell tumors. Pretty common within the sheath of these fingers. Usually benign. Occasionally you can come up with something.”

Gonzalez had his left arm in a sling after the surgery. He is expected to return to Denver Wednesday.

“It helps explain some of the things that CarGo’s been dealing with and why that finger kept blowing up on him,” Rockies manager Walt Weiss said. “It helps answer some of the questions we had about him.

Gonzalez has been experiencing soreness and swelling in the finger for a while. He was examined by Graham on May 29 in Cleveland. He continued to play but was placed on the 15-day DL on June 4 and is expected to miss a few weeks.

“Typically, it’s a couple weeks for the tissue to heal,” Dugger said. “Then he’ll get back his strength and start swinging. It was a little bit more invasive, meaning they took out a larger piece than they thought – what the MRI revealed.”

Gonzalez has dealt with finger issues in the past. Last season he played in just 19 games after the All-Star break due to a sprained middle finger on his right hand.

That injury did not require surgery.

Colorado has been hit hard with injuries in the last month. Third baseman Nolan Arenado (broken left finger) is expected to miss another month and outfielder Michael Cuddyer is out for at least six weeks with a fractured left shoulder suffered Thursday.